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Linear Motion
motion
the background or object that is used for to describe the motion of a body | frame of reference |
the most common frame of reference | earth |
a change in position in a certain amount of time | motion |
rate at which an object moves ---distance traveled/time of travel | speed |
unit for measuring speed | meter(s) per second |
speed of a body does not change | constant speed |
displacement/time | average velocity |
the speed of a body and the direction it travels | velocity |
velocities that are in the same direction are combined by | adding them |
velocities that are in the opposite direction are combined by | subtract the small from the large velocity |
the change in velocity of a body or a change in direction | acceleration |
change in velocity divided by the time during which this change occurs | acceleration |
a decrease in velocity is | negative acceleration |
an increase in velocity is | positive acceleration |
negative acceleration is known as | deceleration |
An object is __________________if its position reltive to a fixed point is changing. | moving |
How fast an object is moving | speed |
Formula for average speed is | total distance / time interval |
The speed of an object at a given moment in time | instantaneous speed |
How fast an object is moving and the direction of travel | velocity |
Velocity of an object does not change over time | constant velocity |
The rate at which velocity is changing | acceleration |
acceleration formula | change in velocity / time interval |
An object moving under the influence of gravity alone is called | free fall |
The acceleration of an object in free fall is about | 10 meters per second squared |
The formula for finding the weight of an object is | mass times acceleration due to gravity |
For each second of free fall, an object falls a _____________________ distance than it did in the previous second | greater distance |
On a speed -versus- time graph the slope represents speed per time, or __________ | acceleration |
Air resistance noticeably ___________ the motion of things with large surface area. | slows |
meters per second squared | unit for acceleration |